Compressor

ABSTRACT

Compressor including a chamber having a muffler room therein for introducing refrigerant compressed at a compression part, a cover on top of the chamber for closing an upper part of the muffler room, and a discharge muffler including a first coating gasket having a base part with coated layers on upper and lower surfaces for sealing between the chamber and the cover, thereby reducing noise and simplifying assembly.

This application claims the benefit of the Korean Application Nos.P2003-080520, and P2003-080521, both filed on Nov. 14, 2003, which arehereby incorporated by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to compressors, and more particularly, toa compressor which has reduced noise, and a structure easy to assemble.

2. Background of the Related Art

In general, the compressor is provided with a compression part forcompressing refrigerant by means of reciprocating movement, a motor partfor driving the compression part, and an enclosed container for holdingthe compression part and the motor part therein. The compressorcompresses refrigerant, a working fluid of a refrigerator or the like,from a low temperature, and low pressure state to a high temperature,and high pressure state. The compression of the refrigerant is made by acompression force applied with a piston reciprocating along a cylinderin the compression part. FIG. 1 illustrates a section of a related artcompressor.

Referring to FIG. 1, the compressor is provided with a container 1having a lower container 1 a and an upper container 1 b on an outside ofthe compressor. The container 1 forms an enclosed space inside thereof,containing a motor part 4 having a stator 2 and a rotor 3. The containeralso has a suction pipe for drawing the refrigerant into an inside ofthe compressor, and a discharge pipe for discharging the refrigerant toan outside of the compressor.

The stator 2 has slots each with a coil wound therearound a number oftimes, and the rotor 3 is rotatably provided to an inside of the stator2. The rotor 3 has a vertical pass through hole 3 a in a center part, inwhich a rotation shaft 5 is mounted. The rotation shaft 5 rotatestogether with the rotor 3 once a power is provided to the coil.

For absorbing vibration taken place in driving the motor part, there area plurality of springs ‘S’ under the stator 2. Accordingly, since thevibration is absorbed by the springs ‘S’, vibration transmitted to anoutside of the compressor is reduced.

There is a balance weight 5 b in an upper part of the rotation shaftprojected in a radial direction for stabilizing the rotation speed ofthe rotation shaft 5. There is an eccentric part 5 a on the balanceweight 5 b eccentric from an axis of the rotation shaft 5. The eccentricpart 5 a is connected to the piston with a connecting rod 9.

In the meantime, the rotation shaft 5 has an oil feed for pumping up oilheld on a bottom of the lower container 1 a. If the rotation shaft 5rotates, the oil is pumped up along the oil feed, and sprayed from theeccentric part 5 a to a cylinder 7, the piston 8, and the connecting rod9.

There is a cylinder block 6 over the motor part. The cylinder block 6has a boss 6 a in a central part projected downward. The rotation shaft5 is passed through, and inserted in the boss 6 a. The cylinder 7 is onthe cylinder block 6 fabricated as one unit. The cylinder 7 has a spacetherein for compressing the refrigerant, along which space the piston 8reciprocates.

There is the connecting rod 9 between the piston 8 and the eccentricpart 5 a. The connecting rod 9 converts rotation of the eccentric part 5a into a horizontal reciprocating movement. For this, the connecting rod9 has one end connected to the piston 8, and the other end connected tothe eccentric part 5 a.

The connecting rod 9 has a hole in the other end having the eccentricpart 5 a rotatably inserted therein. There is a sleeve 10 between theeccentric part 5 a and the hole. The sleeve 10 makes the hole and theeccentric part 5 a to come into close contact. As the piston 8reciprocates, processes of suction, compression and discharge are made,repeatedly.

In the meantime, there is a valve assembly 11 at one side of thecylinder 7 for controlling refrigerant suction into, discharge from thecylinder 7. There is a head cover 12 at an outer side of the valveassembly 11 for isolating the refrigerant being drawn, from therefrigerant being discharged.

There is a suction muffler 13 at a suction side of the head cover 12 forreducing noise from the refrigerant being drawn into the cylinder 7, andpreventing the refrigerant from being heated.

There is a discharge muffler (not shown) adjacent to the cylinder 7. Thedischarge muffler has one end connected to a discharge side of the headcover 12, and the other side connected to a loop pipe 14. The loop pipe14 is connected to a discharge pipe 16 for discharging the hightemperature, and high pressure refrigerant from the cylinder 7 to anoutside of the compressor.

The loop pipe 14 is bent for a number of times for absorbing vibrationcaused by the refrigerant flowing through an inside of the loop pipe 14,and there is a coil weight 14 a on an outside of the loop pipe 14. Thecoil weight 14 a, having a form of a spring, absorbs vibration takenplace at the loop pipe 14. FIG. 2 illustrates a perspective view of arelated art discharge muffler.

Referring to FIG. 2, the discharge muffler 30 is on the cylinder block6. The discharge muffler 30 attenuates noise taken place when therefrigerant is compressed by a piston in a compression chamber 7 a ofthe cylinder 7.

The discharge muffler 30 is provided with a chamber 31, a cover 33, anda bolt 35. The chamber 31 is on the cylinder block 6, and has a spaceform therein. The cover 33 is convex upwardly for covering a top of thechamber 31.

The chamber 31 has a loading surface 31 a in an upper part for loading arim of the cover 33 thereon, and a hole 31 b projected upward from abottom surface. The bolt 35 passes through a central part of the cover33, and fastened to the hole 31 b.

In the meantime, for preventing the refrigerant discharged into aninside of the discharge muffler 30 from leaking, a sealing member 37 isprovided between the loading surface 31 a and the cover 33. FIG. 3illustrates a disassembled perspective view of a valve assembly employedin a related art compressor.

Referring to FIG. 3, the valve assembly 11 is provided with a valveplate 21, a valve spring 25, and a retainer 27. The valve plate 21 has arecess 21 a in a front surface having a discharge valve 23, the valvespring 25, and the retainer 27 received therein. The discharge valve 23has an upper surface with the valve spring 25 in close contacttherewith, and the retainer 27 is fitted on an upper surface of thevalve spring 25 for preventing the discharge valve 23 and the valvespring 25 from playing. There is a gasket 29 between the valve plate 21and the head cover 12, and there is a suction valve ‘V’ on a rearsurface of the valve plate 21.

The recess 21 a has a discharge hole 21 b projected upward, with a seatsurface 21 c around the discharge hole 21 b in contact with thedischarge valve 23. There is a suction hole under the recess 21 a.

The discharge valve 23 has a cover 23 a to be brought into contact withthe seat surface 21 c to open/close the discharge hole 21 b, and a firstfixing part 23 b. The valve spring 25 has a bending part 25 b bentupward, and a second fixing part 25 a to be brought into contact withthe first fixing part 23 b. The retainer 27 is fitted on the valvespring 25, and the first, and second fixing parts 23 b, and 25 a areclamped between the recess 21 a and the retainer 27.

The related art compressor has the following problems.

First, there have been frequent cases when the fixing bolt is fastenedunder a state accurate loading of the sealing member on the loadingsurface failed, to cause one side of the sealing member broken,resulting in leakage of the refrigerant and noise, and a portion of thebroken sealing member to block the pipe.

Second, the repeated hitting of the discharge valve onto the valvespring of the valve assembly increases noise when the refrigerant isdischarged from the compressor.

Third, the many number of components of the valve assembly leads astructure of the valve assembly complicate. Accordingly, the valveassembly costs high, and assembly of the valve assembly is difficult.

SUMMARY OF THE INVENTION

Accordingly, the present invention is directed to a compressor thatsubstantially obviates one or more of the problems due to limitationsand disadvantages of the related art.

An object of the present invention is to provide a compressor which canbe assembled with easy and prevent noise.

Additional features and advantages of the invention will be set forth inthe description which follows, and in part will be apparent to thosehaving ordinary skill in the art upon examination of the following ormay be learned from practice of the invention. The objectives and otheradvantages of the invention will be realized and attained by thestructure particularly pointed out in the written description and claimshereof as well as the appended drawings.

To achieve these objects and other advantages and in accordance with thepurpose of the present invention, as embodied and broadly describedherein, the compressor includes a chamber having a muffler room thereinfor introducing refrigerant compressed at a compression part, a cover ontop of the chamber for closing an upper part of the muffler room, and adischarge muffler including a first coating gasket having a base partwith coated layers on upper and lower surfaces for sealing between thechamber and the cover.

The base part is a disk of metal having a hole at a central part, andthe metal is steel. In more detail, the first coating gasket has a formof a disk having a hole in a central part and a predetermined width in aradial direction for choking a communication part between the mufflerroom and a lower space of the cover.

The cover and the first coating gasket have central holes respectively,the chamber has a fastening hole in a bottom, and the compressor furtherincludes a bolt passed through the holes and fastened to the fasteninghole. The central hole in the first coating gasket has a diametergreater than the bolt, and the fastening hole is projected upward fromthe bottom of the chamber.

The bolt includes a head part held at an upper surface of the cover, anda screw part under the head part for fastening to the fastening hole.The cover and the first coating gasket are clamped between the head partand the chamber as the bolt is fastened.

The cover has an extension from a rim in a lower part thereof, and thechamber has a loading part on an inside wall for loading the extension.The coating layer is formed of elastic rubber.

The compressor further includes a loop pipe at one side of the cover asa refrigerant flow passage from the discharge muffler.

The compression part includes a cylinder for reciprocating of a pistonalong an inside circumferential surface to compress the refrigerant, acylinder block having the cylinder and the discharge muffler fixed to anupper part thereof, and a valve assembly in front of the cylinder forregulating suction and discharge of the refrigerant with reference tothe cylinder.

The chamber is formed as one unit with the cylinder block, and thechamber has a lower part connected to a refrigerant discharge hole ofthe valve assembly.

In other aspect of the present invention, there is provided a compressorincluding a valve assembly including a suction plate in front of acylinder for compressing refrigerant therein, having a suction valve anda discharge passage a valve plate in front of the suction plate, havinga suction hole and a discharge hole, a discharge plate in front of thevalve plate, having a discharge valve for selective opening of thedischarge hole, and a suction passage, a head cover in front of thedischarge plate, for isolating the refrigerant being drawn, from therefrigerant being discharged, and a second coating gasket between thedischarge plate and the head cover, having a retainer for regulatingopening of the discharge plate and a suction passage in one side partthereof.

The second coating gasket includes a base part of metal, and coatedlayers on outside surfaces of the base part, and the metal is steel.

The coated layer is formed of elastic rubber. The second coating gaskethas an opening in an inside part, and the retainer is formed across theopening, and the retainer is bent at opposite side parts to projecttoward the head cover.

The retainer is formed at a position in contact with a front surface ofthe discharge valve, and the retainer deforms elastically in a forwarddirection of the second coating gasket when the discharge valve isopened. The retainer restores from the elastic deformation afterdischarge of refrigerant is finished, to push close the discharge valve.

The suction valve is formed as one unit with the suction plate, and thedischarge valve is formed as one unit with the discharge plate.

The suction valve is opened as the suction valve is pushed backward ofthe suction plate by a pressure of the refrigerant while movement of thesuction valve in a forward direction of the suction plate is held.Opposite to this, the discharge valve is opened as the discharge valveis pushed forward of the discharge plate by a pressure of therefrigerant while movement of the discharge valve in a backwarddirection of the discharge plate is held.

Respective plates and the head cover have holes at four corners thereof,and bolts are inserted in the holes, respectively. The bolts have oneends fastened to a front surface of the cylinder respectively, and theplates, and the head cover are clamped between the head parts of thebolts, and the front surface of the cylinder.

It is to be understood that both the foregoing description and thefollowing detailed description of the present invention are exemplaryand explanatory and are intended to provide further explanation of theinvention claimed.

BRIEF DESCRITPION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention and are incorporated in and constitute apart of this application, illustrate embodiment(s) of the invention andtogether with the description serve to explain the principle of theinvention.

In the drawings;

FIG. 1 illustrates a section of a related art compressor;

FIG. 2 illustrates a perspective disassembled view of a related artdischarge muffler;

FIG. 3 illustrates a perspective disassembled view of a related artvalve assembly;

FIG. 4 illustrates a perspective disassembled view of a dischargemuffler in accordance with a preferred embodiment of the presentinvention;

FIG. 5 illustrates a perspective view of a first coating gasket inaccordance with a preferred embodiment of the present invention;

FIG. 6 illustrates a section of a discharge muffler in accordance with apreferred embodiment of the present invention;

FIG. 7 illustrates a perspective disassembled view of a valve assemblyin accordance with a preferred embodiment of the present invention; and

FIG. 8 illustrates a perspective view of a second coating gasket inaccordance with a preferred embodiment of the present invention, with apartial section.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Reference will now be made in detail to the preferred embodiments of thepresent invention, examples of which are illustrated in the accompanyingdrawings. In describing embodiments of the present invention, same partswill be given the same names and reference symbols, and repetitivedescription of which will be omitted.

Embodiments of the compressor of the present invention will be describedwith reference to FIGS. 4 to 8. FIG. 4 illustrates a perspectivedisassembled view of a discharge muffler in accordance with a preferredembodiment of the present invention, and FIG. 5 illustrates aperspective view of a first coating gasket in accordance with apreferred embodiment of the present invention.

The compressor of the present invention includes a hermetic container, amotor part, and a compression part. The motor part is in the hermeticcontainer, for converting an electric energy into a kinetic energy. Thecompression part compresses the refrigerant by using the kinetic energyconverted by the motor part.

There is a cylinder block 101 over the motor part, and the cylinderblock 101 has a boss 106 projected downward from a central part. Thereis a rotation shaft (not shown) passed through a hole 106 a in the boss106 for transmitting a rotation force from the motor part to thecompression part.

The cylinder block 101 has fastening parts 103 projected downward fromfour corners, to which the stator of the motor part is fastened withbolts.

There is a cylinder 150 in an upper part of the cylinder block 101having a compression chamber 150 a therein for compressing therefrigerant. When a piston reciprocates along the compression chamber150 a horizontally, suction, compression, and discharge processes of therefrigerant are repeated. The cylinder 150 is fabricated with thecylinder block as one unit, or a separate cylinder 150 is fastened to anupper surface of the cylinder block 101 with bolts.

In the meantime, a discharge muffler 300 is provided on one side of thecylinder 150. The discharge muffler 300 attenuates noise emitted whenthe refrigerant compressed at the compression chamber 150 a isdischarged. The discharge muffler 300 includes a chamber 301, a cover400, and a first coating gasket 500.

The chamber 301 is one unit with the cylinder block 101, and has amuffler room 310 therein. There is a semispherical cover 400 convexupward on the chamber 301. A loop pipe ‘P’ is passed through one side ofthe cover 400. The first coating gasket 500 is between the chamber 301and the cover 400.

The muffler room 310 in the chamber 301 is a space for absorbing noiseof the refrigerant compressed at the compression chamber 150 a. Themuffler chamber 310 has a fastening hole 310 a projected upward from abottom for fastening a bolt 450 thereto.

There is a loading part 330 on an inside wall of an upper part of thechamber 301 for loading a rim of the cover. The cover 400 has anextension 410 from the rim. Accordingly, the extension 410 is loaded onthe upper surface of the loading part 330. The bolt 450 is insertedthrough a hole 400 a in an upper part of the cover 400.

FIG. 6 illustrates a section of a discharge muffler in accordance with apreferred embodiment of the present invention.

Referring to FIG. 6, the bolt 450 has a head part 450 a and a screw part450 b. An upper surface of the cover 400 is clamped with the head part450 a. The screw part 450 b is fastened to a fastening hole 310 a in aninside of the chamber 301. The deeper the screw part 450 b is fastenedto the fastening hole 310 a, the stronger the head part 450 a clamps thecover 400.

The first coating gasket 500 is between the extension 410 of the cover400 and the loading part 330 of the chamber 301. The first coatinggasket 500 of a ring form prevents the refrigerant from leaking to anoutside of the discharge muffler 300.

Referring to FIG. 5, the first coating gasket 500 includes a base part510 having coated layers 530, and 550 on upper, and lower surfaces,respectively.

The base part 510 is formed of metal, such as steel. The coated layers530, and 550 are formed of an elastic material, coated on the upper andlower surfaces of the base part 510.

Accordingly, as the bolt 450 is fastened to the fastening hole 310 a,the coated layers 530, and 550 are compressed, to seal between theloading part 330 and the extension 410. It is preferable that the coatedlayer is formed of rubber.

The first coating gasket 500 has a form of a disk having a hole at acenter, and a width in a radial direction. The first coating gasket 500is between the muffler room 310 and the cover 400, and chokes a partmaking an inside space (muffler room) of the chamber 301 and an insidespace of the cover 400 in communication. Thus, the spaces are formed,and transmission of the noise of the refrigerant from the muffler room310 to an upper part of the discharge muffler 300 is suppressed.

In the meantime, the loop pipe P is at one side of the cover 400, fordischarging the refrigerant, compressed at the cylinder 150 andintroduced into the muffler room 310, to an outside of the dischargemuffler through the loop pipe P.

The first coating gasket 500 has a hole 500 a for leading therefrigerant from the muffler room 310 to the cover 400. The hole 500 ahas a diameter greater than the bolt 450. Therefore, the refrigerantflow upward through a gap between an outside circumferential surface ofthe bolt 450 and the hole 500 a. Thereafter, the refrigerant is lead tothe loop pipe ‘P’.

A refrigerant flow in the discharge muffler 200 is as follows.

The refrigerant compressed at the compression chamber 150 a of thecylinder 150 is introduced into the muffler room 310. The noise from therefrigerant is blocked at the first coating gasket 500 on an uppersurface of the muffler room 310. Therefore, noise transmitted to anoutside of the discharge muffler 200 is reduced.

The refrigerant is introduced into the cover 400 between the outsidecircumferential surface of the bolt 450 and the hole 500 a of the firstcoating gasket 500. The refrigerant is discharged to an outside of thedischarge muffler 300 through the loop pipe ‘P’.

In the meantime, a valve assembly 100 is provided in front of thecylinder 150.

FIG. 7 illustrates a perspective disassembled view of a valve assemblyin accordance with a preferred embodiment of the present invention, andFIG. 8 illustrates a perspective view of a second coating gasket in FIG.7, with a partial section.

The valve assembly regulates suction of the refrigerant into thecylinder, as well as discharge of refrigerant compressed at the cylinderby the piston. The valve assembly 100 includes a valve plate 110, asuction plate 130, a discharge plate 140, a second coating gasket 200,and a head cover 170.

The suction plate 130 is in rear of the valve plate 110, and thedischarge plate 140 is in front of the valve plate 110. The head cover170 is on a front surface of the discharge plate 140 for isolating therefrigerant being drawn, from the refrigerant being discharged, and thesecond coating gasket 200 is between the discharge plate 140 and thehead cover 170 for preventing leakage of the refrigerant.

The valve plate 110 is a square plate having a suction hole 110 a forpassing the refrigerant being drawn, and a discharge hole 110 b fordischarging the refrigerant.

The suction plate 130 has a suction valve 130 a formed as one unit. Thesuction valve 130 a having one end connected to the suction plate 130selectively opens/closes the suction hole 110 a. For an example, whenthe suction valve 130 a is pushed backward by a pressure of therefrigerant, the suction valve 130 a is opened.

Also, the suction plate 130 has a discharge passage 130 b above thesuction valve 130 a in communication with the discharge hole 110 b.Therefore, the refrigerant from the cylinder is lead to the dischargehole 110 b through the discharge passage 130 b.

In the meantime, the discharge plate 140 is a square plate having adischarge valve 140 a and a suction passage 140 b. The discharge valve140 a opening/closing the discharge hole 110 b is formed as one unitwith the discharge plate 140. The discharge valve 140 a connected to thedischarge plate 140 opens/closes the discharge hole 110 b, selectively.For an example, when the discharge valve 140 a is pushed forward by apressure of the refrigerant, the discharge valve 140 a is opened.

The discharge plate 140 has a suction passage 140 b at a position facingthe suction hole 110 a below the discharge valve 140 a. Accordingly, therefrigerant opens the suction valve 130 a after passing through thesuction passage 140 b and the suction hole 110 a, and is drawn into thecylinder.

The head cover 170 covers a front surface of the discharge plate 140.The head cover 170 has a dividing wall for isolating the refrigerantbeing drawn, and the refrigerant being discharged.

The second coating gasket 200 is between the discharge plate 140 and thehead cover 170 for preventing the refrigerant from leaking. It ispreferable that the second coating gasket 200 is provided in front ofthe discharge plate 140, because the refrigerant discharged through thedischarge valve 140 a of the discharge plate 140 is in a statecompressed to a high pressure.

Referring to FIG. 8, the second coating gasket 200 is a square platehaving a base part 210 and coated layers 230, and 230′. The base part210 is formed of metal like steel, and the coated layers 230, and 230′are formed on both surfaces of the base part 210, respectively.

The coated layer 230, or 230′ is formed of elastic natural rubber or asynthetic rubber. Moreover, for preventing corrosion from therefrigerant or oil, it is preferable that the coated layers 230 and 230′are formed of a chemical resistance material.

In the meantime, the second coating gasket 200 has a retainer 250 in aninside formed as one unit. The second coating gasket 200 has an openingin an inside part, and the retainer crosses the opening. Opposite sidesof the retainer 250 are bent toward a forward direction of the secondcoating gasket 200.

The retainer 250 is formed at a position opposite to the discharge valve140 a. Therefore, if the discharge valve 140 a is opened, an end of thedischarge valve 140 a is brought into contact with a rear surface of theretainer 250, when the retainer 250 is elastically deformed forwardly.That is, an extent of opening of the discharge valve 140 a is restrictedby the retainer 250. The coating gasket 200 has a suction passage 200 bin a lower part in communication with the suction hole 110 a and thesuction passage 200 b.

Referring to FIG. 7, the suction plate 130, the valve plate 110, thedischarge plate 140, the coating gasket 200, and the head cover 170 haveholes 130 c, 110 c, 140 c, and 170 c at four corners thereof. Byfastening bolts through the holes, the valve assembly 100 is fixed to afront surface of the cylinder.

Referring to FIGS. 4 and 7, the head part of the bolt ‘B’ clamps thehead cover 170, the screw part of the bolt ‘B’ passes through aboveholes, and the holes (150 b in FIG. 4) in the front part of the cylinder(150 in FIG. 4), and fastened to nuts. According to this, the secondcoating gasket 200, the discharge plate 140, the valve plate 110, andthe suction plate 130 are clamped between the head cover 170 and thefront surface of the cylinder rigidly in an above order. The dischargevalve 140 a on the discharge plate 140 is fixed at a position oppositeto the retainer 250 on the coating gasket 200.

The operation of the valve assembly 100 will be described in detail.

The refrigerant drawn through a suction side of the head cover 170passes the suction passages 200 b, and 150 b in succession, and passesthe suction hole 110 a in the valve plate 110. Then, the refrigerantpushes open the suction valve 130 a on the suction plate 130, isintroduced into an inside of the cylinder, and compressed by the piston.

In this instance, when the piston moves forward along the insidecircumferential surface of the cylinder, the suction valve 130 a isclosed by a pressure of the refrigerant being compressed. Then, therefrigerant compressed by the piston passes the discharge passage 130 band the discharge hole 110 b, pushes open the discharge valve 140 a onthe discharge plate 140, and is discharged through a discharge side ofthe head cover 170. In this instance, the discharge valve 140 a pushesthe retainer 250 to deform the retainer 250 in a forward direction.

In this instance, movement of the suction valve 130 a in a forwarddirection of the suction plate 130 is held, and the suction valve 130 ais pushed open in backward of the suction plate 130 by a pressure of therefrigerant.

In the meantime, after discharge of the refrigerant is finished, theretainer 250 restores from the elastic deformation, when the dischargevalve 140 a pushed by the retainer 250 closes the discharge hole 110 b.

As has been described, the compressor of the present invention has thefollowing advantages.

First, the first coating gasket prevents noise of the refrigerant fromtransmitting to an upper part. According to this, since no partitionplate is required under the cover for dividing the space, the dischargemuffler of the present invention has a simple assembly structure, andhigh productivity.

Second, the steel inside of first coating gasket prevents the firstcoating gasket from breaking even if the first coating gasket ispressed.

Third, since the retainer is formed as one unit with the second coatinggasket, and also serves as a valve spring, a structure of the valveassembly is simple, thereby improving a productivity of the hermeticcompressor of the present invention.

Fourth, the second coating gasket is fabricated in a form the steel iscoated with a coating layer. Therefore, the second coating gasket is notdamaged even if the second coating gasket is pressed down in a fasteningprocess.

Fifth, the coating layer on an underside surface of the retainer thedischarge valve is to be brought into contact thereto prevents noisecaused by repetitive contact between the discharge valve and theretainer.

It will be apparent to those skilled in the art that variousmodifications and variations can be made in the present inventionwithout departing from the spirit or scope of the invention. Thus, it isintended that the present invention cover the modifications andvariations of this invention provided they come within the scope of theappended claims and their equivalents.

1. A compressor comprising: a chamber having a muffler room therein forintroducing refrigerant compressed at a compression part; a cover on topof the chamber for closing an upper part of the muffler room; and adischarge muffler including a first coating gasket having a base partwith coated layers on upper and lower surfaces for sealing between thechamber and the cover.
 2. The compressor as claimed in claim 1, whereinthe base part is a disk of metal having a hole at a central part.
 3. Thecompressor as claimed in claim 2, wherein the metal is steel.
 4. Thecompressor as claimed in claim 1, wherein the first coating gasket has aform of a disk having a hole in a central part and a predetermined widthin a radial direction for choking a communication part between themuffler room and a lower space of the cover.
 5. The compressor asclaimed in claim 1, wherein the cover and the first coating gasket havecentral holes respectively, the chamber has a fastening hole in abottom, and the compressor further includes a bolt passed through theholes and fastened to the fastening hole.
 6. The compressor as claimedin claim 5, wherein the central hole in the first coating gasket has adiameter greater than the bolt.
 7. The compressor as claimed in claim 5,wherein the fastening hole is projected upward from the bottom of thechamber.
 8. The compressor as claimed in claim 5, wherein the boltincludes; a head part held at an upper surface of the cover, and a screwpart under the head part for fastening to the fastening hole.
 9. Thecompressor as claimed in claim 7, wherein the cover and the firstcoating gasket are clamped between the head part and the chamber as thebolt is fastened.
 10. The compressor as claimed in claim 1, wherein thecover has an extension from a rim in a lower part thereof, and thechamber has a loading part on an inside wall for loading the extension.11. The compressor as claimed in claim 1, wherein the coating layer isformed of elastic rubber.
 12. The compressor as claimed in claim 1,further comprising a loop pipe at one side of the cover as a refrigerantflow passage from the discharge muffler.
 13. The compressor as claimedin claim 1, wherein the compression part includes; a cylinder forreciprocating of a piston along an inside circumferential surface tocompress the refrigerant, a cylinder block having the cylinder and thedischarge muffler fixed to an upper part thereof, and a valve assemblyin front of the cylinder for regulating suction and discharge of therefrigerant with reference to the cylinder.
 14. The compressor asclaimed in claim 13, wherein the chamber is formed as one unit with thecylinder block.
 15. The compressor as claimed in claim 13, wherein thechamber has a lower part connected to a refrigerant discharge hole ofthe valve assembly.
 16. A compressor comprising a valve assemblyincluding: a suction plate in front of a cylinder for compressingrefrigerant therein, having a suction valve and a discharge passage; avalve plate in front of the suction plate, having a suction hole and adischarge hole; a discharge plate in front of the valve plate, having adischarge valve for selective opening of the discharge hole, and asuction passage; a head cover in front of the discharge plate, forisolating the refrigerant being drawn, from the refrigerant beingdischarged; and a second coating gasket between the discharge plate andthe head cover, having a retainer for regulating opening of thedischarge plate and a suction passage in one side part thereof.
 17. Thecompressor as claimed in claim 16, wherein the second coating gasketincludes; a base part of metal, and coated layers on outside surfaces ofthe base part.
 18. The compressor as claimed in claim 17, wherein themetal is steel.
 19. The compressor as claimed in claim 16, wherein thecoated layer is formed of elastic rubber.
 20. The compressor as claimedin claim 16, wherein the second coating gasket has an opening in aninside part, and the retainer is formed across the opening.
 21. Thecompressor as claimed in claim 20, wherein the retainer is bent atopposite side parts to project toward the head cover.
 22. The compressoras claimed in claim 20, wherein the retainer is formed at a position incontact with a front surface of the discharge valve.
 23. The compressoras claimed in claim 22, wherein the retainer deforms elastically in aforward direction of the second coating gasket when the discharge valveis opened.
 24. The compressor as claimed in claim 22, wherein theretainer restores from the elastic deformation after discharge ofrefrigerant is finished, to push close the discharge valve.
 25. Thecompressor as claimed in claim 16, wherein the suction valve is formedas one unit with the suction plate.
 26. The compressor as claimed inclaim 16, wherein the discharge valve is formed as one unit with thedischarge plate.
 27. The compressor as claimed in claim 16, wherein thesuction valve is opened as the suction valve is pushed backward of thesuction plate by a pressure of the refrigerant while movement of thesuction valve in a forward direction of the suction plate is held. 28.The compressor as claimed in claim 16, wherein the discharge valve isopened as the discharge valve is pushed forward of the discharge plateby a pressure of the refrigerant while movement of the discharge valvein a backward direction of the discharge plate is held.
 29. Thecompressor as claimed in claim 16, wherein respective plates and thehead cover have holes at four corners thereof, and bolts are inserted inthe holes, respectively.
 30. The compressor as claimed in claim 29,wherein the bolts have one ends fastened to a front surface of thecylinder respectively, and the plates, and the head cover are clampedbetween the head parts of the bolts, and the front surface of thecylinder.